There are 58 Democrats in the U.S. Senate, as well as two independents who often vote with the Democrats.

Majority Leader Harry Reid is going to need every one of them if he is to prevail tomorrow night when, as expected, he brings the Senate's version of health-care overhaul to the floor. The vote is only to allow senators to proceed with debate on the bill, which is expected to last well into December. Republicans are unlikely to provide Reid with much, if any, help in the Saturday night vote, intent on preventing debate with a filibuster.

So what do you think the final tally will be? Ben Nelson (NE), Blanche Lincoln (AR) and Mary Landrieu (LA) are thought to be the most likely of the Democrats with second thoughts about the bill. Will they vote to bring it to the floor for debate? A better question: Would Reid bring it to the floor unsure if he has the 60 votes to prevail?

In addition to the actual vote, list those senators you think will break with their respective parties. I'll figure out some prize for those who correctly nail it. Send your prediction, along with your name and address, to politicaljunkie@npr.org. Deadline is 5 p.m. ET today.

Of course, if the final vote turns out to be 60-40, and no one breaks with his or her party, then this is a most boring contest.

Ken Rudin puts out a new Political Junkie column every Monday. It's a look ahead to the events and themes that will be playing out across America's political landscape. PJ is also home to the weekly ScuttleButton puzzle. Remember Ken's column before it came in blog form? The archive is here. Want to contact Ken? Use our handy form.